EntityQ651136· pop 25· linked from 133 articlesTransitSign in to savesatellite navigation systemConnectionsglobal navigation satellite systemEntitymagnetic-core memoryEntitySystems for Nuclear Auxiliary PowerEntitySoviet UnionConceptMount EverestConceptGlobal Positioning SystemEntityWayback MachineEntitydigital object identifierEntitygeodesyEntityrefractionEntitySputnik 1EntityDoppler effectEntityUnited States Air ForceEntityUnited States NavyEntityJohns Hopkins UniversityEntityQ259011Entitycommunications satelliteEntityamateur radioEntitylow Earth orbitEntityephemerisEntityCategories1960 in spaceflight1961 in spaceflight1962 in spaceflight1963 in spaceflightDefunct satellite navigation systemsMilitary electronics of the United StatesMilitary space program of the United StatesNavigation satellite constellationsSatellites in low Earth orbit